Brief Description: Pilot drill 3/32" nose rib angles
1. Drill 3/32" pilot holes in the nose rib angles using Zephyr 90° close quarter drill attachment with a collet to mount a 3/32" straight shaft drill bit. It worked very well. See. Fig. 1.
2. I pilot drilled the extra angle that is on the spar for nose rib4 to accommodate the 15-gal fuel tank option before I realized that I wouldn't be using that angle.
3. Next I adjusted the spar to the correct angle to attach the nose ribs by boosting the rear steel bar on top of a 2x4 and then adjusting the position of the bar.
- the bottom spar cap is bent to 102°, or 12° short of a right angle.
- So, I positioned the rear beam until the angle of the spar was 12° past vertical, as measured by a Harbor Freight angle finder tool.
- The angle tool has a magnetic base which won't attach to aluminum. So, I cut a short piece of 3/4" x 1/8" steel to put on the back side of the spar. The magnet would then hold the tool to the spar. See Fig. 2.
- By moving the rear bar and checking the spar angle at each end of the spar, I was able to achieve a 12° at each end. See Fig. 3.